Electrolytic Etcher: Etcher Tends equipment that electrolytically etches markings, for example insignias, trademarks, and part numbers on metal articles: Turns switches on power control unit to allow flow of electric current through electrolytic solution in tank. Positions workpiece on stencil and against contact strip to complete electric circuit. Places workpiece in electrolytic solution that etches stencil markings on metal. Removes workpiece from solution, after specified time, and sprays workpiece with water to remove acid. Immerses workpiece in rust preventive solution.